Belt-pulley.



No. 66|,079.- Patented Nov. 6, I900. F. RUHRBECK.

BELTPULLEY.

(Application filed July 8, 1899.)

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mus Farms 00.. FHOIOLITNQ, wAsn UNITED STATES I PATENT OFFicn.

FRITZ ROHRBEOK, OFST. VElT-ON FHE-TRIESTING, AUSTRIA I-IUNGARY.

BELT-PULLEY.

PECEFISATION forming part of Letters Patent No. 661,079, dated November 6, 1900.

. Application filed July 3, 1899- Serial No. 722,727. \No model.)

To all whom, it may concern.-

Be it known that I, FRITZ ROHRBECK, a subject of the Emperor of Austria-Hungary, residing at St. veit on-the-Triesting, in the Province of Lower Austria, in the Empire of Austria-Hungary, have invented certain new and useful Improvements in Belt-Pulleys; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it 'appertains to make and use the same, reference being had to the accompanying drawings, and to letters of ref erence marked thereon, which form a part of this specification.

This invention has for its object the construction of light belt-pulleys with very stiff rims and arms. For this purpose both the rim and the arms of a belt-pulley according to this invention are formed by double sheet-metal strips or pieces of band or strip iron, of which those forming the rim are stiffened by one or more groove-like and surrounding pressedout portions of the inner strip and are connected together by turning overthe longitudinal edges of'the outer strip, while the sheet-metal strips or pieces of band or strip iron that form the arms and which are provided with flanged edges to increase their strength form the'opening of the hub or boss and are connected together in pairs and also with the ends of the rim-strips projecting in between them by screw or bolt devices. The screw or bolt devices enable the belt-pulleys to be quickly mounted and securely fastened direct on the shafts with or without keys and also allow the pulleys to be easily and quickly removed and taken to pieces.

Figures 1 to 4 of the accompanying draw ings show by way of example a bipartite beltpulley according to this invention, Fig. 1 being half anelevation and half a vertical section thereof and Figs. 2 and 3 being a vertical ax'a, and a horizontal central section thereo", taken on lines m at and y y, respectively. Fig. 4 is a cross-section through the screw or bolt device of the sheet-metal strips or pieces of ttrip or band iron forming the arms and orsesponds to the line A B of Fig. 1. Fig. 5 represents a boltdevice for enabling a key to be used for connecting the arms with the shaft.

. in a female die and, with theexception of the two ends which project out of the female die and are left plain, is simultaneously provided with one or more groove-shaped swellings c, which-run int-he direction of the longitudinal axis of the strip and stiffen it. The outer and broader strip bis put into a second female die, bent semicircularly therein, and simultaneously turned up at the longitudinal edges. Upon this thefirst-n entioned strip is laid,and the turned-up edges dare bentdown upon the inserted strip, so that they embrace the longitudinal edges of the inserted strip, and the two strips are firmly connected together. On the subsequent connection with one of the two sheet-metal strips or pieces of strip or band iron forming the arms the projecting plain ends 6 of the inner strip are bent down upon the arm-strips.

The arms consist, as stated, of two sheetlnetal strips or pieces of strip or band iron f, each of which is flanged at its longitudinal edges 9 to form a channel and at the same time in the middle part h and, in accordance with the half-diameter of the shaft on which the belt-pulley is to be fastened, provided with a hollow or depression corresponding to the half-of the opening of the hub or boss. In the sheet-metal strips or pieces of band or strip iron f a depression is also made near each of its ends in order to form steps iof a height equal to the thickness of the rimstrips a, so that the ends of the strip a, which are laid upon these steps when the arm-strip fis connected with the rim, form a smooth surface with the arm-strips. Thus it will be seen that the pair of channel-shaped pieces which run diametrically across the pulley, having a struck-up or swaged hub formed therein, are very stiff, the flange g of the channel being an effectual preventive against bending the arms due to the pull at the face of the pulley.

For connecting the two sheet-metal strips or pieces of band or strip ironfwith each other and with the inserted ends of the rimstrips scre w-bolts k are provided, whose heads and nuts bear against cup-shaped pressedlCD out supporting-pieces Z, whose object is to place the heads and nuts so high between the flanges g that a screw-key can be easily applied. screwing up the nuts not merely are the arms firmly connected with the rim, whose outer strips b thereupon abut smoothly against each other with their transverse edges, but the pulley is also securely fastened on the shaft inserted in the opening of the hub or boss. If the connection is to be effected by means of a key m. Fig. 5, a Hat iron piece 3 is inserted between the sheetmetal strips or pieces of strip or band iron f, which in this case are also provided with steps 97, and is fastened by means of the screw-bolt it, which leaves the keyway free.

In lieu of making the rim of two pairs of strips, as described and shown, it may be made of only one pair of strips.

I claiml. A belt-pulley comprising two semicircular parts, each com posed of two strips of sheet metal, the outer strip having its lateral edges bent over the corresponding edges of the inner strip, there being a longitudinal corrugation on the inner strip, the edges of said strip bent inwardly, and a hub having radial arms sccu red to said inwardly-bent ends, substantially as forth.

2. A belt-pulley comprising two complementary semicircular parts, each composed of two strips of sheet metal of different perimeter, the outer strip of greater perimeter having its lateral edges bent over the corresponding edges of the inner strip of least perimeter, the latter having its terminals bent inwardly, and a hub having radial arms secured to said terminals, for the purposes set forth.

3. A split pulley comprised of two semicircnlar parts, each composed of two strips of sheet metal, the outer one formiiig the face of the wheel and having its edges bent over the correst'ionding face of the inner one, the flat ends of the inner strip bent inwardly,and a hub in two sections, radial arms thereon and offsets at the ends of each arm to receive the in wardlybent ends of the inner strip,and a keyway arranged in said arms at the hub, substantially as set forth.

4. A belt.-pnlley comprised of two semicircular parts, each composed of two strips of sheet metal, the outer one forming the face of the wheel and having its lateral edges bent over the corresponding edges of the inner one, the ends of the inner strip bent radially inward, a bellied portion thereon extending between the inwardly-bent ends, and a pair of channel-shaped arms secured to said ends, and a hub formed at the center of said arms, substantially as set forth.

5. A belt-pulley comprising a sheet'metal rim composed of two complementary semicircular sections whose terminals are bent inwardly to form bolt-flanges, and a hub composed of two strips of sheet metal Lj-shaped in cross-section and bent to form-between them shaftbearings, and arms radiating therefrom, said strips being bolted together and to the inturned terminals of the rim, for the purposes set forth.

6. A belt-pulley comprising a sheet-metal rim com posed of two complementary semicircular sections whose terminals are bent inwardly to fortn bolt-flanges, and a hub composed of two strips of sheet metal ]sltaped in cross-section and bent to form between them a shaft-bearing, and arms radiating therefrom, cup-shaped washers Z and bolts It passing through the same and through the webs of the hub-sections and through said webs and the bolt-flanges on the rim-sections respectively, substantially as and for the pprpose set forth.

7. A belt-pulley hubcom posed of two strips of sheet metal l-shaped in cross-section and bent to form between them a shaft-bearing, and arms radiating therefrom, the web of said strips shaped to form a seat radiating -from the shaft-bearing for the reception of a key, in combination with a pulley-rim, and means for securing the same to the radial arms of said hub, for the purposes set forth.

8. A belt-pulley hu b com posed of twostrips of sheet metal i |-shaped in cross-section and bent to form between them a shaft-bearing, and arms radiating therefrom, the web of said strips shaped to form between them a seat radiating from said bearing, a fillingblock inserted in said seat and bolted to the webs of said strips, said block shorter than its seat in a radial direction to form a keyway at the inner end of said seat, in combination with a pulleyrim, and means for securing the same to the radial arms of the hub, substantially as and for the purposes set forth.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

FRITZ ROHRBEOK.

Witnesses:

RUDoLF RoHRBEoK, ALVESTO S. Hoeun. 

